I'm having trouble trying to insert a smart component into an assembly using the API. I followed the example in API Help and everything works fine until I get to the swAssy.AddSmartComponent method. I'm getting the following error -

I'm using SolidWorks 2011 SP5. Here's my code -

Sub InsertComponent(ByVal dblSkPtX As Double, ByVal dblSkPtY As Double, ByVal dblSkPtZ As Double, ByVal strName As String)

        Dim strCompModel As String = "C:\\SignalsTest\\680AG-test.SLDPRT"

        Dim swAssy As AssemblyDoc

        Dim swComponent As Component2

        Dim errors As Long

        Dim warnings As Long

        swApp.OpenDoc6(strCompModel, swDocumentTypes_e.swDocPART, 0, "", errors, warnings)

        swModel = swApp.ActivateDoc2("Car Station assy", True, errors)

        swAssy = swModel

        swComponent = swAssy.AddSmartComponent(strCompModel, dblSkPtX, dblSkPtY, dblSkPtZ) <-- The error occurs here

    End Sub

Any ideas?